Secondary battery.



No. 639,652. Patented Dec. I9, |899. 0. BEHREND.

SECONDARY BATTERY.

(Application med'oct. 3o, 1899.)

(No Model.)

m M W pas Nonms 51ans 00.l PNoYLn'No.. WASHINGTON. n. c:

UNITED STATES PATENT OFFICE.

OSKAR BEHREND, OF FRANKFORT-ON-THE-MAIN, GERMANY.

SECONDARY'BATTERY.

SPECIFICATION forming part of Letters Patent No. 639,652, dated.December 19, 1899.

Application filed October S0, 1899. Serial No. 735,247. (No model.)

T0 all whom t may concern:

Be it known that I, OsKAR BEHREND, a subject of the Emperor of Germany,and a resident of Frankfort-onethe-Main, Germany, have invented certainnew and useful Improvements in Secondary Batteries, of which thefollowing is a specification.

This invention has for its object to provide an improved electricalaccumulator or secondary battery in which the active material is notliable to crumble or fall off from the plates and the plates are notliable to become distorted, while space is econ omized and weightlessened.

According to this invention the positive and negative electrodes areseparated by the materia known as luffah, a plate ofl which is placedbetween each two opposed plates until the whole forms one block of asize such as to allow of its being slid into the receptacle. Thereceptacle is then filled with dilute sulfuric acid or other suitableelectrolyte, and under the action of the electrolyte the luffah platesare still f ur-ther increased by subjecting them to pressure prior totheir use. An electric accumulator or secondary battery thus formed isof small weight and has very little internal resistance and requires buta small quantity of electrolyte, and owing to the elements beingarranged closelyadjacent to each other it is of high capacity inproportion to the size of the receptacle employed. vFor instance, incases where under the usual construction ive pairs of elements would beused, in the arrangement according to my invention seven pairs ofelements can be easily employed. As luah has great absorbing capacity,itis not necessary to charge the accumulator with (or with any largeamount of) unabsorbed electrolyte, so that my electric accumulator orsecondary battery is very useful--for instance, for motors or in othercases where there is liability to concussion or vibrations. vibrationsmay be further reduced by filling any spaces that may exist between theplates or the plates and the receptacle with powdered glass.

In the accompanying drawing the new accumulator is shown in longitudinalsection, c being the outer receptacle, b theelectrodes, and d the glassfilling. e are the stationary walls of the receptacle dividing thelatter into cells.

I. An electric accumulator the electrodes of which are separated onefrom another by a plate or sheet of lu dah as and for the purpose setforth.

2. An electric accumulator the electrodes of which are separated onefrom another by a plate orsheet of luffah which previously has beensubjected to pressure as and for the purpose set forth.

3. An electric accumulator the electrodes of which are separated onefrom another by a plate or sheet vof luifah the remaining spaces betweenthe plates or the plates and the receptacle being filled with powderedglass, as and for the purpose set forth.

4. An electric accumulator the electrodes of which are separated onefrom another by a plate or sheet of luifah which previously has beensubjected to pressure the remaining spaces between the plates or theplates and the receptacle being filled with powdered glass, as and forthe purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

OSKAR BEHREND. Witnesses:

FRANZ HAssLAoHER, HERMANN JACK.

The sensitiveness to concussion and

